Mikr. Anat., vol. 34, pp. 1-10, 1889.

4. HERTWIG, O.: Comparative Embryology of Vertebrates. Especially
vol. 2, pp. 1-241, 1906.

5. REESE, A. M.: The Nasal Passages of the Florida Alligator. Proc.
Acad. Nat. Sc. Phila., 1901.

6. REESE, A. M.: The Development of the American Alligator. Smith. Misc.
Coll., vol. 51, No. 1791, pp. 1-66, 1908.

DESCRIPTION OF FIGURES 1-8, PLATES 1-15

[Transcriber's Note:
The word "Plate" refers to the physical pages on which the Figures
were printed. The word is not used as an illustration identifier.
Based on the author's age at time of publication, "Miss C. M. Reese"
is more likely to have been his sister than his daughter.]

The surface views were drawn, under the author's direction, by
Miss C. M. Reese. The first two of these views were copied, by
permission, from S. F. Clarke; the others were drawn from the
specimens themselves.

All of the figures of any one stage are given the same number,
followed by distinguishing letters, so that it is possible to tell
at a glance what figures belong together.

All of the figures except those from Clarke were drawn under a
camera lucida.

Figure 1. A surface view of an embryo, from the dorsal aspect, at the
beginning of the formation of the enteron.

Figure 1A. A sagittal section of an embryo of approximately the age of
the one shown in figure 1. x 43.

Figure 2. A dorsal view of an embryo with five pairs of mesoblastic
somites.

Figure 2A. A sagittal section of an embryo of the stage shown in
figure 2. x 43.

Figure 2B. A transverse section through the headfold of an embryo of the
stage shown in figure 2. x 43.

Figure 3. A dorsal view of an embryo with about fifteen pairs of
somites. x 20.

Figures 3A-3D. A series of transverse sections through an embryo of the
stage of the one shown in figure 3. x 43.

Figure 4. A surface view of an embryo with about twenty pairs of
somites. x (about) 15.

Figures 4A-4D. A series of transverse sections through the anterior end
of an embryo of the approximate age of the one shown in figure 4. x 20.

Figures 4E and 4F. Two transverse sections through the thyroid gland of
this stage; more highly magnified. x 102.

Figures 4G-4M. A series of transverse sections caudad to the preceding.
Figure 4H, x 43; other figures, x 20.

Figure 5. A surface view, in profile, of an embryo at the time of the
origin of the limbs. x (about) 5.

Figures 5A-5I. A serie